Ponente:  Lugar:  Fecha: 19 de octubre, 2010, 16:00h Organización:   

Coordinación: Dirección General de Universidades e Investigación, a través de la Fundación madri+d, Comunidad de Madrid La iniciativa IMDEA participará en la actividad “Por qué soy científico”, por medio de la intervención los directores de cada uno de los ocho institutos que la componen. Por qué soy científico Organizador: Instituto Madrileño de Estudios Avanzados (IMDEA) Horario: De 18:00 a 19:30 Lugar de celebración y accesos: Medialab Prado C/ Alameda, 15. Madrid Metro: Atocha y Cercanías: Atocha Autobuses: 6, 10, 14, 19, 26, 27, 32, 34, 37 y 45

Dr. Kenichi Mase, Dr. Toshini Tsuboi and Dr. Hiromi Ueda will visit Institute IMDEA Networkson Monday September 20th and will take the opportunity to present their research lines. The overall talk will last about 45 minutes, including questions and answers, and it will be divided in the following three 15 minute slots:

It this talk I will start with a brief overview of the research activities of our group at the University of New South Wales, Sydney, Australia, in the areas of core network switching, body area networking, and security for wireless sensor networks. I will then focus on the specific problem of sizing buffers in core routers, highlighting constraints posed by power consumption and optical storage technology. We investigate the impact of router buffer size on the characteristics of TCP traffic and its co-existence with open-loop traffic. We propose and analyze the efficacy of techniques such as traffic conditioning and forward error correction in managing contention loss in the network core. Finally, we speculate on the feasibility of a future Internet core with near-zero buffers.

Multimedia content delivery is projected to be the biggest bandwidth consumer of the future Internet. For many years, the mechanism for content delivery envisioned by the networking community is network multicast. Multicasting emulates traditional TV broadcasting; it is designed to be network efficient. But it falls short in at least two aspects: (a) it does not maximize throughput for content delivery; (b) like TV broadcasting, it does not provide on-demand access (i.e. Video-on-Demand).

Cloud computing has great potential to change how enterprises run and manage their IT systems. Cloud computing platforms provide customers with flexible, on demand resources at low cost. However, while existing offerings are useful for providing basic computation and storage resources, they fail to provide the security and network controls that enterprise customers need. The CloudNet architecture provides more comprehensive control over network resources and security for users by utilizing Virtual Private Networks to securely and seamlessly link cloud and enterprise sites. CloudNet incorporates VM migration over WANs. CloudNet's capability for WAN migration transforms the scope of provisioning from a single data center to multiple data centers spread across the country or the world. This will open new opportunities for cross data center load balancing and dynamic application placement based on metrics like latency to users or energy cost. It also provides the foundation for a range of Disaster Recovery solutions. (The talk is based on joint work with Timothy Wood (UMass), Jacobus van der Merwe (AT&T Labs Research), and Prashant Shenoy (UMass) ).

Delay is a key Internet performance metric and its stability, variation, and abrupt changes have been well studied. However, little could have been said about the Internet-wide delay distribution. In order to build a representative sample set for the Internet-wide delay distribution, one needs to draw data from a random selection of source hosts to destination hosts and there is no measurement system with access to every AS and subnet of the Internet. In this work we propose to apply the path-stitching algorithm to archival measurement data and reconstruct the past history of Internet delay distribution. The two main advantages of path stitching are that data from existing measurement projects is sufficient to provide accurate estimates and it produces delay estimates between almost any two hosts in the Internet.

El próximo lunes, Ruben Cuevas defenderá su tesis titulada: “Dynamic and Location-Aware Server Discovery Using a Fair Distributed Hash Table”, tutorada por la Dr. Carmen Guerrero, Profesor Titular, Universidad Carlos III de Madrid e investigador de NETCOM Research Group.

Embedded sensor systems are well suited to provide context data, i.e. any information which allows determining the context of entities (e.g. a user's location, an object's environmental parameters, or the number of people in a room). The additional integration of actuators allows interaction with the real world, e.g. control of heating, ventilation, or lighting. However, the big gap between the heterogeneous set of devices providing sensing and/or actuation needs to be bridged to enable smart context-aware applications. Special consideration hereby needs to be given to the efficient use of the available energy budget and the support for device heterogeneity. In this talk, means towards energy-efficient data transfer by applying header and payload compression for Wireless Sensor and Actuator Networks (WSAN) are presented, as well as our approach towards the seamless integration of WSAN nodes through using semantic self-descriptions and means towards unifying the access to node resources.

IMDEA Networks is organizing its 2nd Annual International Workshop, this year focusing on Energy Efficiency and Networking on 31st May – 1st June, 2010 in Madrid, Spain. The workshop will include presentations and a panel dealing with the latest advances and challenges facing the field. Energy efficiency is becoming one of the most important issues of our time. Population growth and exhaustion of available energy sources makes clever use of energy one of the main challenges for our society. The objective of this workshop is to explore the role of networking in the general effort towards sustainable use of energy.